2. 外语
  3. My father______(过去经常出差), but now he has already retired.

My father______(过去经常出差), but now he has already retired.

admin2012-10-30  49
问题 My father______(过去经常出差), but now he has already retired.
选项
答案used to travel a lot oil business
解析 本题考查used to do，be used to do 和be used to sth．/doing sth的区别。Used to do指过去经常发生的动作；be used to do意思是“被用来做……”；be used to sth．/doing sth．意为“习惯于”。
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大学英语四级

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